[R] subscript with comma

[suse]

Thank you! It works now. 
But I still don't understand, how all these expressions, "", paste, group,
eval... have to be used together.  (For example, I first tried
expression(sm[w,grass]) but it didn't work, and I couldn't find, why (and
when) commas are interpreted here differently). So: Is there somewhere an
introduction (rather than examples) to this? Books, documents etc.

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